The background synchronization API registers a service worker callback to run only when the device is no longer offline. You can use this to let users continue using your app while offline and synchronize with a server after reconnecting.

Learning resources on MDN

• Background Synchronization API

Browser support

• Chrome 49 Released on 2016-03-02
• Chrome Android 49 Released on 2016-03-09
• Edge 79 Released on 2020-01-15
• Firefox ❌ Vendor position : negative
• Firefox for Android ❌ Vendor position : negative
• Safari ❌ See webkit.org/b/182565
• Safari on iOS ❌ See webkit.org/b/182565

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